Question 633899
Find the slope of the line that goes through the given points.

(-3, -7), (9, -7)

Use the given conditions to write an equation for the line in point-slope form.

Slope = 4, passing through (-3, 7)

Use the given conditions to write an equation for the line in point-slope form.

Slope = 6/7, passing through (8, 7)

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Do them like this.  The slope is given, you don't have to do that part.
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Find the slope of the line that goes through the given points. 
(3,-5), (-9,-8)
Find the slope, m
m = diffy/diffx = -3/-12 = 1/4
Use y = mx + b and either point to find b
-5 = (1/4)*3 + b
b = -23/4
--> y = x/4 - 23/4